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Hardware realization of test section walls of transonic wind tunnels on the basis of theoretical analysis and experimential research
Borivoj Blizanac
The accent is on the interference of wind tunnel test section walls and its elimination. The interference resulting from test section walls must be eliminated by these same walls in order to achieve conditions of free flight on their surfaces. The analytical calculation of the interference that has to be eliminated by partially open walls is impossible because of an extremely local character of the air flow in the vicinity of perforated walls, i.e. very high influence of viscosity effects in this range. The paper shows some of the most important and most interesting research efforts, mostly preformed in wind tunnels of the first and second generation, from the aspect of obtaining an optimum geometry wind tunnel test section walls.
Key words: transonic wind tunnel, test section, walls.
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